PHOTONIS’ patented ELECTROGEN™ Electron Generator Arrays (EGAs) consist of millions of precision glass tubes fused together to produce a uniform and mechanically rigid structure. They are processed such that, when a voltage is applied across the thickness, each pore produces a beam of electrons.

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Because each of the millions of pores produce electrons, the resultant electron flux is extremely uniform and dense. EGAs can be used as the electron source in electron impact ionization source applications. This technology has the advantage of performing as a cold ionization source, which eliminates pyrolytic effects that occur when the heat generated by the filament chemically changes the unknown substances to be identified.